Mark Ruffalo as Dan Mulligan

Keira Knightley as Gretta James

Adam Levine as Dave Kohl

Hailee Steinfeld as Violet Mulligan

Catherine Keener as Miriam Hart

James Corden as Steve

Yasiin Bey as Saul

Aya Cash as Jenny

Maddie Corman as Phillis

Karen Pittman as Business Woman

Paul Romero as Bartender

Andrew Sellon as Christian Father

Ed Renninger as Barman

Eric Burton as Singer Songwriter 2

Marco Assante as Marco

Mary Catherine Garrison as Jill

Jen Jacob as Dave Fangirl

Rob Morrow as CEO

Jennifer Li Jackson as Mim

Ian Brodsky as Malcolm

Shannon Walsh as Rachel

David Abeles as Glen

Ann McGowan as Ballet Teacher

Ron Voz as Butler

Cee Lo Green as Troublegum

Kena Onyenjekwe as Troublegum Posse 1 - Rappa DD

Harvey Morris as Troublegum Posse 2 - Phat Jimmy

Terry Lewis as Troublegum Crew Member - Benson

Colin Love as Singing Basketball Player

Jimmy Palumbo as Guy Shouting from Window

Simon Delaney as Lawyer

Danielle Brisebois as Singer

Keen Ruffalo as Keen

Melissa Maria Gonzalez as Chris

Nicholas Daniel Gonzalez as Zach

David Pendleton as Homeless Man

Madison Love as Singer Songwriter 1

Joanna Mauer as On Camera Musician

Erik Detusch as On Camera Musician

Rich Mercurio as On Camera Musician

Emilie Cardinaux as On Camera Musician

Curtis Fowlkes as On Camera Musician

Emily Yarbourgh as On Camera Musician

Erin Benin as On Camera Musician

Alexis Sykes as On Camera Musician

Julia Bruskin as On Camera Musician

Stacey Maltin as Young Girl

Sama Fernands as Concert Attendee (uncredited)